Why does "Monitor of Built-in Analog Audio" Has no Sound?

Question

I currently have a Let's Play Channel on Youtube, so, I need to record gameplay footage  (video and audio) along with microphone audio (in a separate file, with audacity).
I found a software called Simple Screen Recorder (SSR) to record gameplay video and audio footage, I have checked the website for instructions on how to adjust the things and the problems began.
First, the video is recorded just fine, it's the simplest software I could find to set up the configurations and get it up and running. Problem is, no gameplay audio, no system audio. Audacity records the microphone just well, so I started to take a look on the configurations on PulseAudio Volume Control while recording something with SSR. Many tutorials tell to change the audio imput to Monitor of Built-in Analog Audio in order to record the gameplay audio, but this did not work to me here.
I suspect that this Monitor of Built-in Analog Audio is not configured or that it does not have audio to be recorded at all, how can I fix this?

Daniel T · Answer

It is also possible to do this through the command line. This uses the pactl command like CMCDragonkai requested.

Open a terminal and type pactl set-source-mute alsa_output
Press tab
Add false at the end and press enter
Continue with Audacity like in steps 5 and 6 of falconer's answer

On my machine, the command would be pactl set-source-mute alsa_output.pci-0000_00_1f.3.analog-stereo.monitor false. You might also need to adjust the volume like pactl set-source-volume alsa_output.pci-0000_00_1f.3.analog-stereo.monitor 100%

rohan · Answer

My experience was with Audacity, had worked easily enough in previous Ubuntu versions.
I'm now using 10.14 LTS. I installed the pavucontrol, and soon got it working. Not without fiddling with a few things. See below

Make sure you go to Configuration in the pavucontrol tool. I had to select "Analog stereo ouput". Then go to Audacity and choose Pulse Pulse Video:0, in the main panel of Audacity. Then I was able to record. Thanks for this post!

falconer · Answer

I don't know how far you got in this process, so I start from the beginning:

Install pavucontrol:
sudo apt-get install pavucontrol

Launch it:
pavucontrol

On the Input Devices tab select Show: All input devices

Check the Volume level and if necessary Unmute the Monitor of Built-in Analog Audio channel by clicking on the little speaker icon.

Launch Audacity, start recording

While Audacity is recording: In the pavucontrol Recording tab change the Input Source for Audacity to Monitor of Built-in Analog Audio

Why does "Monitor of Built-in Analog Audio" Has no Sound?

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